Do I even have a rental agreement?

[ailwyn]

Answers from people familiar with legal principles and especially California law are most welcome. Others, not so much.

Making a long story short, I have some issues regarding maintenance in my apartment, where I've lived for about 5 years. Please don't answer "just move," because I like my apt tho there are maintenance issues. When I tried to formalize my complaints with the prop mgmt co, which I'll call XYZ Management, I ran into dead ends trying to find their street address, and have been unable to find a DBA or RE license for the exact company name.

The Dept of RE said their negligence to maintain the building and how they represent themselves is against their rules and suggested I file a request for investigation, which I did a few days ago. It got me to wondering if I have a valid rental agreement. It says it's between me and (my street address) and XYZ. (No further words or letters)

There's an LLC with my street address but I don't know much about it. According to county records, my apt is owned by 3 individuals, not an LLC (last I checked). I make my checks out to the one guy who has 50% ownership. As far as I can tell, there's no relationship with them and XYZ other than he hires them for management. I don't have his contact info either. (I drop my rent check through a mail slot in the building.)

What are the legal implications if I have a rental agreement between myself and two entities that either don't exist legally or are improperly identified? Does it carry any weight? Can they get me to sign a new corrected one, if I've been here 5 years?